netdev - Re: [PATCH net-next v6 0/3] The huawei_cdc

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Date:	Mon, 17 Mar 2014 14:15:23 +0100
From:	Bjørn Mork <bjorn@...k.no>
To:	Pasi Kärkkäinen <pasik@....fi>
Cc:	Dan Williams <dcbw@...hat.com>, netdev@...r.kernel.org,
	linux-usb@...r.kernel.org, Enrico Mioso <mrkiko.rs@...il.com>,
	Oliver Neukum <oliver@...kum.org>
Subject: Re: [PATCH net-next v6 0/3] The huawei_cdc_ncm driver / E3276 problem

Pasi Kärkkäinen <pasik@....fi> writes:

> After playing with it for a while I got this:
>
> [ 1082.972880] cdc_ncm_setup: huawei_cdc_ncm 3-1:1.1: dwNtbInMaxSize=262144 dwNtbOutMaxSize=32768 wNdpOutPayloadRemainder=2 wNdpOutDivisor=4 wNdpOutAlignment=4 wNtbOutMaxDatagrams=0 flags=0x1f
> [ 1082.972893] cdc_ncm_setup: huawei_cdc_ncm 3-1:1.1: Using default maximum receive length=32768
> [ 1082.973281] cdc_ncm_setup: huawei_cdc_ncm 3-1:1.1: Setting NTB format to 16-bit failed
>
> .. which looks to be related..

Yes, that is what I expected after thinking long enough to realize that
I could just read this out of the usbmon dump you provided.

Thanks a lot for all your help providing extremely useful debug info
here.  This helped fixing (soon, anyway :-) a nasty bug, hitting only a
few devices.

I still don't know for sure, but I do hope this bug is the real cause of
the problems you are having.  I'll send you a patch for testing as soon
as it is ready.

Bjørn
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